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1、翻译原文一：Design of Small Core DrawingMechanism for Injection MouldWu Guang ming (Dongguan Science and Technical School, of Guang Dong province Dongguan 523000)Abstract: Four kinds of small and nimble core drawing mechanism for injection mould of case type plastic items are introduced in details.Key wor
2、ds: injection mould, core drawing, sliding blockCase type plastic items play an important role in the production of modern plastic-electronic items. In general, knots sometimes together with a bolt are used to enhancer and smooth the surface of the electronic products. A mould often holds several wo
3、rk pieces, and core drawing is used many times in just one work piece. If we use traditional outside slanting pillar or inside slanting slide block in core drawing, the mechanism of the mould would be very complicated. In practice, Figure 11. moving die insert 2. moving die pate 3. spring 4. core sl
4、ide block5. fixed die insert 6. fixed die plate 7. lock insert block 8. center pin 9. spring 10.fixed plate of moving die according to the property that the stroke of core drawing of plastic items is very short, several kinds of core drawing mechanisms are designed as follows.1 Outside core drawing
5、mechanismOutside core drawing mechanism as in Fig.1 is similar to traditional slanting pillar core drawing mechanism, Because of the short stroke of core drawing, slanting pillar is removed. Lock insert block 7 and core slide block 4 serve together to accomplish the action of reset and lock. When th
6、e mould is opened, moving die and fixed die are parted and core slide block 4 finishes core drawing under control of spring 3. Center pin 8 is used to locate the core slide block. Core slide block 4 has T guide way machined to ensure the accuracy of core drawing movement.Figure 21. moving die insert
7、 2. center pin 3. core slide block 4. fixed die insert 5. lock insert 6. fixed die plate 7. spring 8. moving die plate 2 Inside core drawing mechanism Slanting slide block detached core drawing or drawing or slanting thimble are often used in traditional inside core drawing mechanisms. It is hard to
8、 machine. Because the distance of friction movement of slanting slide pole is long, and friction device is hidden in the middle of the mould, it is difficult to lubricate and the slanting slide pole tends to be easily worn down. Slanting slide block inside drawing mechanism in Fig.2 solves this prob
9、lem well. When the dies are closed, core slide block 3 resets under the influence of lock insert 5. When the dies are opened, block 3 and lock insert 5 is parted and block 3 finishes core drawing under control of spring 7. Center pin 2 is used to locate the core slide block. The whole mechanism is d
10、ependent and easy to machine.3 Compound mechanism that core draws inside and outside at the same timeWhen a mould holds several different work-pieces and has to be core drawn inside and outside at the same time, compound core drawing mechanism illustrated in Fi.3 can be used. The picture shows the s
11、tate when the dies are closed. The Figure 31.moving die insert 2.spring 3. outside core insert 4. fixed die insert 5.fixed die plate 6. lock insert 7. fixed die insert 8. moving die insert 9.inside core insert 10. core slide block 11. center pin 12. moving die plate slants of lock insert 6 and core
12、slide block 10 cooperate to reset and lock the core. When the dies are opened, core slide block 10 finishes inside and outside core drawing at the same time under control of spring 2. The position is limited by center pin 11. To make the core easily machined and conveniently maintained, the core can
13、 be made to be assembled. When two different cases need core drawing outside at the same time, compound mechanism in Fig.4 can be used. With the use of two slanting insert blocks, the mechanism is simplified, and the strength condition on lock insert is greatly improved.4 A simplified core drawing m
14、echanismFor outside core drawing whole mould space is not so large, a simplified mechanism as shown in Fig.5 can be used. When the dies are closed, slanting slide block 3 oppresses spring 6 and resets under the influence of fixed die insert 1.Figure 41. moving die insert 2. fixed die plate 3. spring
15、 4. moving die plate5. spring 6. core slide block 7. fixed die insert 8. fixed die plate9. lock insert 10. fixed die insert 11. core slide block 12.spring 13.spring 14.moving die insert Two guide pins 5 serve to guide. When the dies are opened, moving die insert 1 is parted from moving plate 4 and s
16、lanting slide block 3 slides up along guide pin 5 to finish core drawing under influence of spring 6. Core drawing is accomplished in one instant so that the time of opening mould is shortened and the productivity is improved. This kind of core drawing mechanism can be changed to be used for fixed mould core drawing.It has been proved by practice that core
